HVAC ACRONYMS
Below are some of the Acronyms you will come across in the Heating and Air Conditioning World:
AGA – American Gas Association
AHU – Air Handling Unit
AMU – Air Make-up Unit
ASHRAE – American Society of Heating, Refrigeration & Air Conditioning Engineers
BAS – Building Automation System / DDC
BRS – Building Related Illness
BTU – British Thermal Unit
CEC – California Energy Commission
CGA – Canadian Gas Association
CFM – Cubic Feet Per Minute
CHWR – Chilled Water Return
CHWS – Chilled Water Supply
CO2 – Carbon Dioxide
CV – Constant Volume
CWS/CWR – Chilled Water Supply/Return for Cooling Towers
DDC – Direct Digital Control
Linc Service®
MSI Pre-training
HVAC Acronyms
Delta P – Change in Pressure Across a Device or System
Delta T – Change in Temperature Across a Device or System
DCW – Domestic Cold Water
DHW – Domestic Hot Water
DHWR – Domestic Hot Water Return
DWV – Drain, Waste, Vent
DX – Direct Expansion
EF – Exhaust Fan
EMS – Energy Management System / DDC
EPACT – Energy Policy Act (United States)
ERV – Energy Recovery Ventilator
FA – Forced Air
FWA – Forced Warm Air
GAMA – Gas Appliance Manufacturers Association
GPH /GPM– Gallons Per Hour/Gallons Per Minute
HP – Horsepower
HRV – Heat Recovery Ventilator
HUM – Humidifier
HVAC – Heating, Ventilation & Air Conditioning
Linc Service®
MSI Pre-training
HVAC Acronyms
HX – Heat Exchanger
IAQ – Indoor Air Quality
KW – Kilowatt /One Thousand Watts
kWH – Kilowatt Hour
LRA – Locked Rotor Amperage
MAF – Media Air Filter
MUA – Make Up Air
NBIC – National Boiler Inspection Code
NEC – National Electric Code
NFPA – National Fire Protection Association
NG – Natural Gas
NOX – Nitrogen Oxide
NTS – Not to Scale
O2 – Oxygen
OAHU – Outside Air Handling Unit
OEM – Original Equipment Manufacturer
P&T – Pressure and Temperature (relief valve)
pH – the Measure of Acid or Alkalinity
PO – Purchase Order
Linc Service®
MSI Pre-training
HVAC Acronyms
PPM – Parts Per Million
PRV – Pressure Reducing Valve
PSI – Pounds per Square Inch
P-T – Pressure – Temperature
R – Thermal Resistance (also refrigerant)
Rad – Radiator
RH – Relative Humidity (also right hand)
RPM – Revolutions per Minute
RT – Rooftop Unit
RTU – Roof Top Unit
Sch or Sched – Schedule (pipe thickness)
SBS – Sick Building Syndrome
SEER – Seasonal Energy Efficiency Ratio
SG – Sight Glass
TLA – Three Letter Acronym
TON – Cooling power of one ton of ice in one day (12,000 BTU)
TXV – Thermal Expansion Valve
UFH – Under Floor Heating
UH – Unit Heater
Linc Service®
MSI Pre-training
HVAC Acronyms
UL – Underwriters Laboratories
UST – Underground Storage Tank
VAV – Variable Air Volume
VIF – Verify in Field
WH – Water Heater (gas-fired)
